1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> 4 * Horst Hummel <Horst.Hummel@de.ibm.com> 5 * Martin Schwidefsky <schwidefsky@de.ibm.com> 6 * Bugreports.to..: <Linux390@de.ibm.com> 7 * Copyright IBM Corp. 1999, 2009 8 */ 9 10 #ifndef DASD_INT_H 11 #define DASD_INT_H 12 13 /* we keep old device allocation scheme; IOW, minors are still in 0..255 */ 14 #define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS)) 15 #define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1) 16 17 /* 18 * States a dasd device can have: 19 * new: the dasd_device structure is allocated. 20 * known: the discipline for the device is identified. 21 * basic: the device can do basic i/o. 22 * unfmt: the device could not be analyzed (format is unknown). 23 * ready: partition detection is done and the device is can do block io. 24 * online: the device accepts requests from the block device queue. 25 * 26 * Things to do for startup state transitions: 27 * new -> known: find discipline for the device and create devfs entries. 28 * known -> basic: request irq line for the device. 29 * basic -> ready: do the initial analysis, e.g. format detection, 30 * do block device setup and detect partitions. 31 * ready -> online: schedule the device tasklet. 32 * Things to do for shutdown state transitions: 33 * online -> ready: just set the new device state. 34 * ready -> basic: flush requests from the block device layer, clear 35 * partition information and reset format information. 36 * basic -> known: terminate all requests and free irq. 37 * known -> new: remove devfs entries and forget discipline. 38 */ 39 40 #define DASD_STATE_NEW 0 41 #define DASD_STATE_KNOWN 1 42 #define DASD_STATE_BASIC 2 43 #define DASD_STATE_UNFMT 3 44 #define DASD_STATE_READY 4 45 #define DASD_STATE_ONLINE 5 46 47 #include <linux/module.h> 48 #include <linux/wait.h> 49 #include <linux/blkdev.h> 50 #include <linux/genhd.h> 51 #include <linux/hdreg.h> 52 #include <linux/interrupt.h> 53 #include <linux/log2.h> 54 #include <asm/ccwdev.h> 55 #include <linux/workqueue.h> 56 #include <asm/debug.h> 57 #include <asm/dasd.h> 58 #include <asm/idals.h> 59 #include <linux/bitops.h> 60 #include <linux/blk-mq.h> 61 62 /* DASD discipline magic */ 63 #define DASD_ECKD_MAGIC 0xC5C3D2C4 64 #define DASD_DIAG_MAGIC 0xC4C9C1C7 65 #define DASD_FBA_MAGIC 0xC6C2C140 66 67 /* 68 * SECTION: Type definitions 69 */ 70 struct dasd_device; 71 struct dasd_block; 72 73 /* BIT DEFINITIONS FOR SENSE DATA */ 74 #define DASD_SENSE_BIT_0 0x80 75 #define DASD_SENSE_BIT_1 0x40 76 #define DASD_SENSE_BIT_2 0x20 77 #define DASD_SENSE_BIT_3 0x10 78 79 /* BIT DEFINITIONS FOR SIM SENSE */ 80 #define DASD_SIM_SENSE 0x0F 81 #define DASD_SIM_MSG_TO_OP 0x03 82 #define DASD_SIM_LOG 0x0C 83 84 /* lock class for nested cdev lock */ 85 #define CDEV_NESTED_FIRST 1 86 #define CDEV_NESTED_SECOND 2 87 88 /* 89 * SECTION: MACROs for klogd and s390 debug feature (dbf) 90 */ 91 #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \ 92 do { \ 93 debug_sprintf_event(d_device->debug_area, \ 94 d_level, \ 95 d_str "\n", \ 96 d_data); \ 97 } while(0) 98 99 #define DBF_EVENT(d_level, d_str, d_data...)\ 100 do { \ 101 debug_sprintf_event(dasd_debug_area, \ 102 d_level,\ 103 d_str "\n", \ 104 d_data); \ 105 } while(0) 106 107 #define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...) \ 108 do { \ 109 struct ccw_dev_id __dev_id; \ 110 ccw_device_get_id(d_cdev, &__dev_id); \ 111 debug_sprintf_event(dasd_debug_area, \ 112 d_level, \ 113 "0.%x.%04x " d_str "\n", \ 114 __dev_id.ssid, __dev_id.devno, d_data); \ 115 } while (0) 116 117 /* limit size for an errorstring */ 118 #define ERRORLENGTH 30 119 120 /* definition of dbf debug levels */ 121 #define DBF_EMERG 0 /* system is unusable */ 122 #define DBF_ALERT 1 /* action must be taken immediately */ 123 #define DBF_CRIT 2 /* critical conditions */ 124 #define DBF_ERR 3 /* error conditions */ 125 #define DBF_WARNING 4 /* warning conditions */ 126 #define DBF_NOTICE 5 /* normal but significant condition */ 127 #define DBF_INFO 6 /* informational */ 128 #define DBF_DEBUG 6 /* debug-level messages */ 129 130 /* messages to be written via klogd and dbf */ 131 #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\ 132 do { \ 133 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \ 134 dev_name(&d_device->cdev->dev), d_args); \ 135 DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \ 136 } while(0) 137 138 #define MESSAGE(d_loglevel,d_string,d_args...)\ 139 do { \ 140 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ 141 DBF_EVENT(DBF_ALERT, d_string, d_args); \ 142 } while(0) 143 144 /* messages to be written via klogd only */ 145 #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\ 146 do { \ 147 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \ 148 dev_name(&d_device->cdev->dev), d_args); \ 149 } while(0) 150 151 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\ 152 do { \ 153 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ 154 } while(0) 155 156 /* Macro to calculate number of blocks per page */ 157 #define BLOCKS_PER_PAGE(blksize) (PAGE_SIZE / blksize) 158 159 struct dasd_ccw_req { 160 unsigned int magic; /* Eye catcher */ 161 struct list_head devlist; /* for dasd_device request queue */ 162 struct list_head blocklist; /* for dasd_block request queue */ 163 164 /* Where to execute what... */ 165 struct dasd_block *block; /* the originating block device */ 166 struct dasd_device *memdev; /* the device used to allocate this */ 167 struct dasd_device *startdev; /* device the request is started on */ 168 struct dasd_device *basedev; /* base device if no block->base */ 169 void *cpaddr; /* address of ccw or tcw */ 170 unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */ 171 char status; /* status of this request */ 172 short retries; /* A retry counter */ 173 unsigned long flags; /* flags of this request */ 174 struct dasd_queue *dq; 175 176 /* ... and how */ 177 unsigned long starttime; /* jiffies time of request start */ 178 unsigned long expires; /* expiration period in jiffies */ 179 char lpm; /* logical path mask */ 180 void *data; /* pointer to data area */ 181 182 /* these are important for recovering erroneous requests */ 183 int intrc; /* internal error, e.g. from start_IO */ 184 struct irb irb; /* device status in case of an error */ 185 struct dasd_ccw_req *refers; /* ERP-chain queueing. */ 186 void *function; /* originating ERP action */ 187 188 /* these are for statistics only */ 189 unsigned long buildclk; /* TOD-clock of request generation */ 190 unsigned long startclk; /* TOD-clock of request start */ 191 unsigned long stopclk; /* TOD-clock of request interrupt */ 192 unsigned long endclk; /* TOD-clock of request termination */ 193 194 /* Callback that is called after reaching final status. */ 195 void (*callback)(struct dasd_ccw_req *, void *data); 196 void *callback_data; 197 }; 198 199 /* 200 * dasd_ccw_req -> status can be: 201 */ 202 #define DASD_CQR_FILLED 0x00 /* request is ready to be processed */ 203 #define DASD_CQR_DONE 0x01 /* request is completed successfully */ 204 #define DASD_CQR_NEED_ERP 0x02 /* request needs recovery action */ 205 #define DASD_CQR_IN_ERP 0x03 /* request is in recovery */ 206 #define DASD_CQR_FAILED 0x04 /* request is finally failed */ 207 #define DASD_CQR_TERMINATED 0x05 /* request was stopped by driver */ 208 209 #define DASD_CQR_QUEUED 0x80 /* request is queued to be processed */ 210 #define DASD_CQR_IN_IO 0x81 /* request is currently in IO */ 211 #define DASD_CQR_ERROR 0x82 /* request is completed with error */ 212 #define DASD_CQR_CLEAR_PENDING 0x83 /* request is clear pending */ 213 #define DASD_CQR_CLEARED 0x84 /* request was cleared */ 214 #define DASD_CQR_SUCCESS 0x85 /* request was successful */ 215 216 /* default expiration time*/ 217 #define DASD_EXPIRES 300 218 #define DASD_EXPIRES_MAX 40000000 219 #define DASD_RETRIES 256 220 #define DASD_RETRIES_MAX 32768 221 222 /* per dasd_ccw_req flags */ 223 #define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */ 224 #define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */ 225 #define DASD_CQR_VERIFY_PATH 2 /* path verification request */ 226 #define DASD_CQR_ALLOW_SLOCK 3 /* Try this request even when lock was 227 * stolen. Should not be combined with 228 * DASD_CQR_FLAGS_USE_ERP 229 */ 230 /* 231 * The following flags are used to suppress output of certain errors. 232 */ 233 #define DASD_CQR_SUPPRESS_NRF 4 /* Suppress 'No Record Found' error */ 234 #define DASD_CQR_SUPPRESS_FP 5 /* Suppress 'File Protected' error*/ 235 #define DASD_CQR_SUPPRESS_IL 6 /* Suppress 'Incorrect Length' error */ 236 #define DASD_CQR_SUPPRESS_CR 7 /* Suppress 'Command Reject' error */ 237 238 /* 239 * There is no reliable way to determine the number of available CPUs on 240 * LPAR but there is no big performance difference between 1 and the 241 * maximum CPU number. 242 * 64 is a good trade off performance wise. 243 */ 244 #define DASD_NR_HW_QUEUES 64 245 #define DASD_MAX_LCU_DEV 256 246 #define DASD_REQ_PER_DEV 4 247 248 /* Signature for error recovery functions. */ 249 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *); 250 251 /* 252 * A single CQR can only contain a maximum of 255 CCWs. It is limited by 253 * the locate record and locate record extended count value which can only hold 254 * 1 Byte max. 255 */ 256 #define DASD_CQR_MAX_CCW 255 257 258 /* 259 * Unique identifier for dasd device. 260 */ 261 #define UA_NOT_CONFIGURED 0x00 262 #define UA_BASE_DEVICE 0x01 263 #define UA_BASE_PAV_ALIAS 0x02 264 #define UA_HYPER_PAV_ALIAS 0x03 265 266 struct dasd_uid { 267 __u8 type; 268 char vendor[4]; 269 char serial[15]; 270 __u16 ssid; 271 __u8 real_unit_addr; 272 __u8 base_unit_addr; 273 char vduit[33]; 274 }; 275 276 /* 277 * the struct dasd_discipline is 278 * sth like a table of virtual functions, if you think of dasd_eckd 279 * inheriting dasd... 280 * no, currently we are not planning to reimplement the driver in C++ 281 */ 282 struct dasd_discipline { 283 struct module *owner; 284 char ebcname[8]; /* a name used for tagging and printks */ 285 char name[8]; /* a name used for tagging and printks */ 286 int max_blocks; /* maximum number of blocks to be chained */ 287 288 struct list_head list; /* used for list of disciplines */ 289 290 /* 291 * Device recognition functions. check_device is used to verify 292 * the sense data and the information returned by read device 293 * characteristics. It returns 0 if the discipline can be used 294 * for the device in question. uncheck_device is called during 295 * device shutdown to deregister a device from its discipline. 296 */ 297 int (*check_device) (struct dasd_device *); 298 void (*uncheck_device) (struct dasd_device *); 299 300 /* 301 * do_analysis is used in the step from device state "basic" to 302 * state "accept". It returns 0 if the device can be made ready, 303 * it returns -EMEDIUMTYPE if the device can't be made ready or 304 * -EAGAIN if do_analysis started a ccw that needs to complete 305 * before the analysis may be repeated. 306 */ 307 int (*do_analysis) (struct dasd_block *); 308 309 /* 310 * This function is called, when new paths become available. 311 * Disciplins may use this callback to do necessary setup work, 312 * e.g. verify that new path is compatible with the current 313 * configuration. 314 */ 315 int (*verify_path)(struct dasd_device *, __u8); 316 317 /* 318 * Last things to do when a device is set online, and first things 319 * when it is set offline. 320 */ 321 int (*basic_to_ready) (struct dasd_device *); 322 int (*online_to_ready) (struct dasd_device *); 323 int (*basic_to_known)(struct dasd_device *); 324 325 /* (struct dasd_device *); 326 * Device operation functions. build_cp creates a ccw chain for 327 * a block device request, start_io starts the request and 328 * term_IO cancels it (e.g. in case of a timeout). format_device 329 * formats the device and check_device_format compares the format of 330 * a device with the expected format_data. 331 * handle_terminated_request allows to examine a cqr and prepare 332 * it for retry. 333 */ 334 struct dasd_ccw_req *(*build_cp) (struct dasd_device *, 335 struct dasd_block *, 336 struct request *); 337 int (*start_IO) (struct dasd_ccw_req *); 338 int (*term_IO) (struct dasd_ccw_req *); 339 void (*handle_terminated_request) (struct dasd_ccw_req *); 340 int (*format_device) (struct dasd_device *, 341 struct format_data_t *, int); 342 int (*check_device_format)(struct dasd_device *, 343 struct format_check_t *, int); 344 int (*free_cp) (struct dasd_ccw_req *, struct request *); 345 346 /* 347 * Error recovery functions. examine_error() returns a value that 348 * indicates what to do for an error condition. If examine_error() 349 * returns 'dasd_era_recover' erp_action() is called to create a 350 * special error recovery ccw. erp_postaction() is called after 351 * an error recovery ccw has finished its execution. dump_sense 352 * is called for every error condition to print the sense data 353 * to the console. 354 */ 355 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *); 356 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *); 357 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *, 358 struct irb *); 359 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *); 360 void (*check_for_device_change) (struct dasd_device *, 361 struct dasd_ccw_req *, 362 struct irb *); 363 364 /* i/o control functions. */ 365 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *); 366 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *); 367 int (*ioctl) (struct dasd_block *, unsigned int, void __user *); 368 369 /* suspend/resume functions */ 370 int (*freeze) (struct dasd_device *); 371 int (*restore) (struct dasd_device *); 372 373 /* reload device after state change */ 374 int (*reload) (struct dasd_device *); 375 376 int (*get_uid) (struct dasd_device *, struct dasd_uid *); 377 void (*kick_validate) (struct dasd_device *); 378 int (*check_attention)(struct dasd_device *, __u8); 379 int (*host_access_count)(struct dasd_device *); 380 int (*hosts_print)(struct dasd_device *, struct seq_file *); 381 void (*handle_hpf_error)(struct dasd_device *, struct irb *); 382 void (*disable_hpf)(struct dasd_device *); 383 int (*hpf_enabled)(struct dasd_device *); 384 void (*reset_path)(struct dasd_device *, __u8); 385 }; 386 387 extern struct dasd_discipline *dasd_diag_discipline_pointer; 388 389 /* 390 * Notification numbers for extended error reporting notifications: 391 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's 392 * eer pointer) is freed. The error reporting module needs to do all necessary 393 * cleanup steps. 394 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers). 395 */ 396 #define DASD_EER_DISABLE 0 397 #define DASD_EER_TRIGGER 1 398 399 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */ 400 #define DASD_EER_FATALERROR 1 401 #define DASD_EER_NOPATH 2 402 #define DASD_EER_STATECHANGE 3 403 #define DASD_EER_PPRCSUSPEND 4 404 405 /* DASD path handling */ 406 407 #define DASD_PATH_OPERATIONAL 1 408 #define DASD_PATH_TBV 2 409 #define DASD_PATH_PP 3 410 #define DASD_PATH_NPP 4 411 #define DASD_PATH_MISCABLED 5 412 #define DASD_PATH_NOHPF 6 413 #define DASD_PATH_CUIR 7 414 #define DASD_PATH_IFCC 8 415 416 #define DASD_THRHLD_MAX 4294967295U 417 #define DASD_INTERVAL_MAX 4294967295U 418 419 struct dasd_path { 420 unsigned long flags; 421 u8 cssid; 422 u8 ssid; 423 u8 chpid; 424 struct dasd_conf_data *conf_data; 425 atomic_t error_count; 426 unsigned long errorclk; 427 }; 428 429 430 struct dasd_profile_info { 431 /* legacy part of profile data, as in dasd_profile_info_t */ 432 unsigned int dasd_io_reqs; /* number of requests processed */ 433 unsigned int dasd_io_sects; /* number of sectors processed */ 434 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */ 435 unsigned int dasd_io_times[32]; /* histogram of requests's times */ 436 unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */ 437 unsigned int dasd_io_time1[32]; /* hist. of time from build to start */ 438 unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */ 439 unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */ 440 unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */ 441 unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */ 442 443 /* new data */ 444 struct timespec64 starttod; /* time of start or last reset */ 445 unsigned int dasd_io_alias; /* requests using an alias */ 446 unsigned int dasd_io_tpm; /* requests using transport mode */ 447 unsigned int dasd_read_reqs; /* total number of read requests */ 448 unsigned int dasd_read_sects; /* total number read sectors */ 449 unsigned int dasd_read_alias; /* read request using an alias */ 450 unsigned int dasd_read_tpm; /* read requests in transport mode */ 451 unsigned int dasd_read_secs[32]; /* histogram of request's sizes */ 452 unsigned int dasd_read_times[32]; /* histogram of requests's times */ 453 unsigned int dasd_read_time1[32]; /* hist. time from build to start */ 454 unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */ 455 unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */ 456 unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */ 457 unsigned long dasd_sum_times; /* sum of request times */ 458 unsigned long dasd_sum_time_str; /* sum of time from build to start */ 459 unsigned long dasd_sum_time_irq; /* sum of time from start to irq */ 460 unsigned long dasd_sum_time_end; /* sum of time from irq to end */ 461 }; 462 463 struct dasd_profile { 464 struct dentry *dentry; 465 struct dasd_profile_info *data; 466 spinlock_t lock; 467 }; 468 469 struct dasd_device { 470 /* Block device stuff. */ 471 struct dasd_block *block; 472 473 unsigned int devindex; 474 unsigned long flags; /* per device flags */ 475 unsigned short features; /* copy of devmap-features (read-only!) */ 476 477 /* extended error reporting stuff (eer) */ 478 struct dasd_ccw_req *eer_cqr; 479 480 /* Device discipline stuff. */ 481 struct dasd_discipline *discipline; 482 struct dasd_discipline *base_discipline; 483 void *private; 484 struct dasd_path path[8]; 485 __u8 opm; 486 487 /* Device state and target state. */ 488 int state, target; 489 struct mutex state_mutex; 490 int stopped; /* device (ccw_device_start) was stopped */ 491 492 /* reference count. */ 493 atomic_t ref_count; 494 495 /* ccw queue and memory for static ccw/erp buffers. */ 496 struct list_head ccw_queue; 497 spinlock_t mem_lock; 498 void *ccw_mem; 499 void *erp_mem; 500 struct list_head ccw_chunks; 501 struct list_head erp_chunks; 502 503 atomic_t tasklet_scheduled; 504 struct tasklet_struct tasklet; 505 struct work_struct kick_work; 506 struct work_struct restore_device; 507 struct work_struct reload_device; 508 struct work_struct kick_validate; 509 struct work_struct suc_work; 510 struct work_struct requeue_requests; 511 struct timer_list timer; 512 513 debug_info_t *debug_area; 514 515 struct ccw_device *cdev; 516 517 /* hook for alias management */ 518 struct list_head alias_list; 519 520 /* default expiration time in s */ 521 unsigned long default_expires; 522 unsigned long default_retries; 523 524 unsigned long blk_timeout; 525 526 unsigned long path_thrhld; 527 unsigned long path_interval; 528 529 struct dentry *debugfs_dentry; 530 struct dentry *hosts_dentry; 531 struct dasd_profile profile; 532 }; 533 534 struct dasd_block { 535 /* Block device stuff. */ 536 struct gendisk *gdp; 537 struct request_queue *request_queue; 538 spinlock_t request_queue_lock; 539 struct blk_mq_tag_set tag_set; 540 struct block_device *bdev; 541 atomic_t open_count; 542 543 unsigned long blocks; /* size of volume in blocks */ 544 unsigned int bp_block; /* bytes per block */ 545 unsigned int s2b_shift; /* log2 (bp_block/512) */ 546 547 struct dasd_device *base; 548 struct list_head ccw_queue; 549 spinlock_t queue_lock; 550 551 atomic_t tasklet_scheduled; 552 struct tasklet_struct tasklet; 553 struct timer_list timer; 554 555 struct dentry *debugfs_dentry; 556 struct dasd_profile profile; 557 }; 558 559 struct dasd_attention_data { 560 struct dasd_device *device; 561 __u8 lpum; 562 }; 563 564 struct dasd_queue { 565 spinlock_t lock; 566 }; 567 568 /* reasons why device (ccw_device_start) was stopped */ 569 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */ 570 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */ 571 #define DASD_STOPPED_PENDING 4 /* long busy */ 572 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */ 573 #define DASD_STOPPED_SU 16 /* summary unit check handling */ 574 #define DASD_STOPPED_PM 32 /* pm state transition */ 575 #define DASD_UNRESUMED_PM 64 /* pm resume failed state */ 576 577 /* per device flags */ 578 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */ 579 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */ 580 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */ 581 #define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't 582 * confuse this with the user specified 583 * read-only feature. 584 */ 585 #define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */ 586 #define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */ 587 #define DASD_FLAG_SUSPENDED 9 /* The device was suspended */ 588 #define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/ 589 #define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */ 590 #define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */ 591 #define DASD_FLAG_PATH_VERIFY 13 /* Path verification worker running */ 592 #define DASD_FLAG_SUC 14 /* unhandled summary unit check */ 593 594 #define DASD_SLEEPON_START_TAG ((void *) 1) 595 #define DASD_SLEEPON_END_TAG ((void *) 2) 596 597 void dasd_put_device_wake(struct dasd_device *); 598 599 /* 600 * Reference count inliners 601 */ 602 static inline void 603 dasd_get_device(struct dasd_device *device) 604 { 605 atomic_inc(&device->ref_count); 606 } 607 608 static inline void 609 dasd_put_device(struct dasd_device *device) 610 { 611 if (atomic_dec_return(&device->ref_count) == 0) 612 dasd_put_device_wake(device); 613 } 614 615 /* 616 * The static memory in ccw_mem and erp_mem is managed by a sorted 617 * list of free memory chunks. 618 */ 619 struct dasd_mchunk 620 { 621 struct list_head list; 622 unsigned long size; 623 } __attribute__ ((aligned(8))); 624 625 static inline void 626 dasd_init_chunklist(struct list_head *chunk_list, void *mem, 627 unsigned long size) 628 { 629 struct dasd_mchunk *chunk; 630 631 INIT_LIST_HEAD(chunk_list); 632 chunk = (struct dasd_mchunk *) mem; 633 chunk->size = size - sizeof(struct dasd_mchunk); 634 list_add(&chunk->list, chunk_list); 635 } 636 637 static inline void * 638 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size) 639 { 640 struct dasd_mchunk *chunk, *tmp; 641 642 size = (size + 7L) & -8L; 643 list_for_each_entry(chunk, chunk_list, list) { 644 if (chunk->size < size) 645 continue; 646 if (chunk->size > size + sizeof(struct dasd_mchunk)) { 647 char *endaddr = (char *) (chunk + 1) + chunk->size; 648 tmp = (struct dasd_mchunk *) (endaddr - size) - 1; 649 tmp->size = size; 650 chunk->size -= size + sizeof(struct dasd_mchunk); 651 chunk = tmp; 652 } else 653 list_del(&chunk->list); 654 return (void *) (chunk + 1); 655 } 656 return NULL; 657 } 658 659 static inline void 660 dasd_free_chunk(struct list_head *chunk_list, void *mem) 661 { 662 struct dasd_mchunk *chunk, *tmp; 663 struct list_head *p, *left; 664 665 chunk = (struct dasd_mchunk *) 666 ((char *) mem - sizeof(struct dasd_mchunk)); 667 /* Find out the left neighbour in chunk_list. */ 668 left = chunk_list; 669 list_for_each(p, chunk_list) { 670 if (list_entry(p, struct dasd_mchunk, list) > chunk) 671 break; 672 left = p; 673 } 674 /* Try to merge with right neighbour = next element from left. */ 675 if (left->next != chunk_list) { 676 tmp = list_entry(left->next, struct dasd_mchunk, list); 677 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) { 678 list_del(&tmp->list); 679 chunk->size += tmp->size + sizeof(struct dasd_mchunk); 680 } 681 } 682 /* Try to merge with left neighbour. */ 683 if (left != chunk_list) { 684 tmp = list_entry(left, struct dasd_mchunk, list); 685 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) { 686 tmp->size += chunk->size + sizeof(struct dasd_mchunk); 687 return; 688 } 689 } 690 __list_add(&chunk->list, left, left->next); 691 } 692 693 /* 694 * Check if bsize is in { 512, 1024, 2048, 4096 } 695 */ 696 static inline int 697 dasd_check_blocksize(int bsize) 698 { 699 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize)) 700 return -EMEDIUMTYPE; 701 return 0; 702 } 703 704 /* externals in dasd.c */ 705 #define DASD_PROFILE_OFF 0 706 #define DASD_PROFILE_ON 1 707 #define DASD_PROFILE_GLOBAL_ONLY 2 708 709 extern debug_info_t *dasd_debug_area; 710 extern struct dasd_profile dasd_global_profile; 711 extern unsigned int dasd_global_profile_level; 712 extern const struct block_device_operations dasd_device_operations; 713 714 extern struct kmem_cache *dasd_page_cache; 715 716 struct dasd_ccw_req * 717 dasd_kmalloc_request(int , int, int, struct dasd_device *); 718 struct dasd_ccw_req * 719 dasd_smalloc_request(int , int, int, struct dasd_device *); 720 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *); 721 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *); 722 void dasd_wakeup_cb(struct dasd_ccw_req *, void *); 723 724 static inline int 725 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device) 726 { 727 return set_normalized_cda(ccw, cda); 728 } 729 730 struct dasd_device *dasd_alloc_device(void); 731 void dasd_free_device(struct dasd_device *); 732 733 struct dasd_block *dasd_alloc_block(void); 734 void dasd_free_block(struct dasd_block *); 735 736 enum blk_eh_timer_return dasd_times_out(struct request *req, bool reserved); 737 738 void dasd_enable_device(struct dasd_device *); 739 void dasd_set_target_state(struct dasd_device *, int); 740 void dasd_kick_device(struct dasd_device *); 741 void dasd_restore_device(struct dasd_device *); 742 void dasd_reload_device(struct dasd_device *); 743 void dasd_schedule_requeue(struct dasd_device *); 744 745 void dasd_add_request_head(struct dasd_ccw_req *); 746 void dasd_add_request_tail(struct dasd_ccw_req *); 747 int dasd_start_IO(struct dasd_ccw_req *); 748 int dasd_term_IO(struct dasd_ccw_req *); 749 void dasd_schedule_device_bh(struct dasd_device *); 750 void dasd_schedule_block_bh(struct dasd_block *); 751 int dasd_sleep_on(struct dasd_ccw_req *); 752 int dasd_sleep_on_queue(struct list_head *); 753 int dasd_sleep_on_immediatly(struct dasd_ccw_req *); 754 int dasd_sleep_on_interruptible(struct dasd_ccw_req *); 755 void dasd_device_set_timer(struct dasd_device *, int); 756 void dasd_device_clear_timer(struct dasd_device *); 757 void dasd_block_set_timer(struct dasd_block *, int); 758 void dasd_block_clear_timer(struct dasd_block *); 759 int dasd_cancel_req(struct dasd_ccw_req *); 760 int dasd_flush_device_queue(struct dasd_device *); 761 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *); 762 void dasd_generic_free_discipline(struct dasd_device *); 763 void dasd_generic_remove (struct ccw_device *cdev); 764 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *); 765 int dasd_generic_set_offline (struct ccw_device *cdev); 766 int dasd_generic_notify(struct ccw_device *, int); 767 int dasd_generic_last_path_gone(struct dasd_device *); 768 int dasd_generic_path_operational(struct dasd_device *); 769 void dasd_generic_shutdown(struct ccw_device *); 770 771 void dasd_generic_handle_state_change(struct dasd_device *); 772 int dasd_generic_pm_freeze(struct ccw_device *); 773 int dasd_generic_restore_device(struct ccw_device *); 774 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *); 775 void dasd_generic_path_event(struct ccw_device *, int *); 776 int dasd_generic_verify_path(struct dasd_device *, __u8); 777 778 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int); 779 char *dasd_get_sense(struct irb *); 780 781 void dasd_device_set_stop_bits(struct dasd_device *, int); 782 void dasd_device_remove_stop_bits(struct dasd_device *, int); 783 784 int dasd_device_is_ro(struct dasd_device *); 785 786 void dasd_profile_reset(struct dasd_profile *); 787 int dasd_profile_on(struct dasd_profile *); 788 void dasd_profile_off(struct dasd_profile *); 789 char *dasd_get_user_string(const char __user *, size_t); 790 791 /* externals in dasd_devmap.c */ 792 extern int dasd_max_devindex; 793 extern int dasd_probeonly; 794 extern int dasd_autodetect; 795 extern int dasd_nopav; 796 extern int dasd_nofcx; 797 798 int dasd_devmap_init(void); 799 void dasd_devmap_exit(void); 800 801 struct dasd_device *dasd_create_device(struct ccw_device *); 802 void dasd_delete_device(struct dasd_device *); 803 804 int dasd_get_feature(struct ccw_device *, int); 805 int dasd_set_feature(struct ccw_device *, int, int); 806 807 int dasd_add_sysfs_files(struct ccw_device *); 808 void dasd_remove_sysfs_files(struct ccw_device *); 809 810 struct dasd_device *dasd_device_from_cdev(struct ccw_device *); 811 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *); 812 struct dasd_device *dasd_device_from_devindex(int); 813 814 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *); 815 struct dasd_device *dasd_device_from_gendisk(struct gendisk *); 816 817 int dasd_parse(void) __init; 818 int dasd_busid_known(const char *); 819 820 /* externals in dasd_gendisk.c */ 821 int dasd_gendisk_init(void); 822 void dasd_gendisk_exit(void); 823 int dasd_gendisk_alloc(struct dasd_block *); 824 void dasd_gendisk_free(struct dasd_block *); 825 int dasd_scan_partitions(struct dasd_block *); 826 void dasd_destroy_partitions(struct dasd_block *); 827 828 /* externals in dasd_ioctl.c */ 829 int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long); 830 831 /* externals in dasd_proc.c */ 832 int dasd_proc_init(void); 833 void dasd_proc_exit(void); 834 835 /* externals in dasd_erp.c */ 836 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *); 837 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *); 838 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int, 839 struct dasd_device *); 840 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *); 841 void dasd_log_sense(struct dasd_ccw_req *, struct irb *); 842 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb); 843 844 /* externals in dasd_3990_erp.c */ 845 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *); 846 void dasd_3990_erp_handle_sim(struct dasd_device *, char *); 847 848 /* externals in dasd_eer.c */ 849 #ifdef CONFIG_DASD_EER 850 int dasd_eer_init(void); 851 void dasd_eer_exit(void); 852 int dasd_eer_enable(struct dasd_device *); 853 void dasd_eer_disable(struct dasd_device *); 854 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr, 855 unsigned int id); 856 void dasd_eer_snss(struct dasd_device *); 857 858 static inline int dasd_eer_enabled(struct dasd_device *device) 859 { 860 return device->eer_cqr != NULL; 861 } 862 #else 863 #define dasd_eer_init() (0) 864 #define dasd_eer_exit() do { } while (0) 865 #define dasd_eer_enable(d) (0) 866 #define dasd_eer_disable(d) do { } while (0) 867 #define dasd_eer_write(d,c,i) do { } while (0) 868 #define dasd_eer_snss(d) do { } while (0) 869 #define dasd_eer_enabled(d) (0) 870 #endif /* CONFIG_DASD_ERR */ 871 872 873 /* DASD path handling functions */ 874 875 /* 876 * helper functions to modify bit masks for a given channel path for a device 877 */ 878 static inline int dasd_path_is_operational(struct dasd_device *device, int chp) 879 { 880 return test_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags); 881 } 882 883 static inline int dasd_path_need_verify(struct dasd_device *device, int chp) 884 { 885 return test_bit(DASD_PATH_TBV, &device->path[chp].flags); 886 } 887 888 static inline void dasd_path_verify(struct dasd_device *device, int chp) 889 { 890 __set_bit(DASD_PATH_TBV, &device->path[chp].flags); 891 } 892 893 static inline void dasd_path_clear_verify(struct dasd_device *device, int chp) 894 { 895 __clear_bit(DASD_PATH_TBV, &device->path[chp].flags); 896 } 897 898 static inline void dasd_path_clear_all_verify(struct dasd_device *device) 899 { 900 int chp; 901 902 for (chp = 0; chp < 8; chp++) 903 dasd_path_clear_verify(device, chp); 904 } 905 906 static inline void dasd_path_operational(struct dasd_device *device, int chp) 907 { 908 __set_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags); 909 device->opm |= (0x80 >> chp); 910 } 911 912 static inline void dasd_path_nonpreferred(struct dasd_device *device, int chp) 913 { 914 __set_bit(DASD_PATH_NPP, &device->path[chp].flags); 915 } 916 917 static inline int dasd_path_is_nonpreferred(struct dasd_device *device, int chp) 918 { 919 return test_bit(DASD_PATH_NPP, &device->path[chp].flags); 920 } 921 922 static inline void dasd_path_clear_nonpreferred(struct dasd_device *device, 923 int chp) 924 { 925 __clear_bit(DASD_PATH_NPP, &device->path[chp].flags); 926 } 927 928 static inline void dasd_path_preferred(struct dasd_device *device, int chp) 929 { 930 __set_bit(DASD_PATH_PP, &device->path[chp].flags); 931 } 932 933 static inline int dasd_path_is_preferred(struct dasd_device *device, int chp) 934 { 935 return test_bit(DASD_PATH_PP, &device->path[chp].flags); 936 } 937 938 static inline void dasd_path_clear_preferred(struct dasd_device *device, 939 int chp) 940 { 941 __clear_bit(DASD_PATH_PP, &device->path[chp].flags); 942 } 943 944 static inline void dasd_path_clear_oper(struct dasd_device *device, int chp) 945 { 946 __clear_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags); 947 device->opm &= ~(0x80 >> chp); 948 } 949 950 static inline void dasd_path_clear_cable(struct dasd_device *device, int chp) 951 { 952 __clear_bit(DASD_PATH_MISCABLED, &device->path[chp].flags); 953 } 954 955 static inline void dasd_path_cuir(struct dasd_device *device, int chp) 956 { 957 __set_bit(DASD_PATH_CUIR, &device->path[chp].flags); 958 } 959 960 static inline int dasd_path_is_cuir(struct dasd_device *device, int chp) 961 { 962 return test_bit(DASD_PATH_CUIR, &device->path[chp].flags); 963 } 964 965 static inline void dasd_path_clear_cuir(struct dasd_device *device, int chp) 966 { 967 __clear_bit(DASD_PATH_CUIR, &device->path[chp].flags); 968 } 969 970 static inline void dasd_path_ifcc(struct dasd_device *device, int chp) 971 { 972 set_bit(DASD_PATH_IFCC, &device->path[chp].flags); 973 } 974 975 static inline int dasd_path_is_ifcc(struct dasd_device *device, int chp) 976 { 977 return test_bit(DASD_PATH_IFCC, &device->path[chp].flags); 978 } 979 980 static inline void dasd_path_clear_ifcc(struct dasd_device *device, int chp) 981 { 982 clear_bit(DASD_PATH_IFCC, &device->path[chp].flags); 983 } 984 985 static inline void dasd_path_clear_nohpf(struct dasd_device *device, int chp) 986 { 987 __clear_bit(DASD_PATH_NOHPF, &device->path[chp].flags); 988 } 989 990 static inline void dasd_path_miscabled(struct dasd_device *device, int chp) 991 { 992 __set_bit(DASD_PATH_MISCABLED, &device->path[chp].flags); 993 } 994 995 static inline int dasd_path_is_miscabled(struct dasd_device *device, int chp) 996 { 997 return test_bit(DASD_PATH_MISCABLED, &device->path[chp].flags); 998 } 999 1000 static inline void dasd_path_nohpf(struct dasd_device *device, int chp) 1001 { 1002 __set_bit(DASD_PATH_NOHPF, &device->path[chp].flags); 1003 } 1004 1005 static inline int dasd_path_is_nohpf(struct dasd_device *device, int chp) 1006 { 1007 return test_bit(DASD_PATH_NOHPF, &device->path[chp].flags); 1008 } 1009 1010 /* 1011 * get functions for path masks 1012 * will return a path masks for the given device 1013 */ 1014 1015 static inline __u8 dasd_path_get_opm(struct dasd_device *device) 1016 { 1017 return device->opm; 1018 } 1019 1020 static inline __u8 dasd_path_get_tbvpm(struct dasd_device *device) 1021 { 1022 int chp; 1023 __u8 tbvpm = 0x00; 1024 1025 for (chp = 0; chp < 8; chp++) 1026 if (dasd_path_need_verify(device, chp)) 1027 tbvpm |= 0x80 >> chp; 1028 return tbvpm; 1029 } 1030 1031 static inline __u8 dasd_path_get_nppm(struct dasd_device *device) 1032 { 1033 int chp; 1034 __u8 npm = 0x00; 1035 1036 for (chp = 0; chp < 8; chp++) { 1037 if (dasd_path_is_nonpreferred(device, chp)) 1038 npm |= 0x80 >> chp; 1039 } 1040 return npm; 1041 } 1042 1043 static inline __u8 dasd_path_get_ppm(struct dasd_device *device) 1044 { 1045 int chp; 1046 __u8 ppm = 0x00; 1047 1048 for (chp = 0; chp < 8; chp++) 1049 if (dasd_path_is_preferred(device, chp)) 1050 ppm |= 0x80 >> chp; 1051 return ppm; 1052 } 1053 1054 static inline __u8 dasd_path_get_cablepm(struct dasd_device *device) 1055 { 1056 int chp; 1057 __u8 cablepm = 0x00; 1058 1059 for (chp = 0; chp < 8; chp++) 1060 if (dasd_path_is_miscabled(device, chp)) 1061 cablepm |= 0x80 >> chp; 1062 return cablepm; 1063 } 1064 1065 static inline __u8 dasd_path_get_cuirpm(struct dasd_device *device) 1066 { 1067 int chp; 1068 __u8 cuirpm = 0x00; 1069 1070 for (chp = 0; chp < 8; chp++) 1071 if (dasd_path_is_cuir(device, chp)) 1072 cuirpm |= 0x80 >> chp; 1073 return cuirpm; 1074 } 1075 1076 static inline __u8 dasd_path_get_ifccpm(struct dasd_device *device) 1077 { 1078 int chp; 1079 __u8 ifccpm = 0x00; 1080 1081 for (chp = 0; chp < 8; chp++) 1082 if (dasd_path_is_ifcc(device, chp)) 1083 ifccpm |= 0x80 >> chp; 1084 return ifccpm; 1085 } 1086 1087 static inline __u8 dasd_path_get_hpfpm(struct dasd_device *device) 1088 { 1089 int chp; 1090 __u8 hpfpm = 0x00; 1091 1092 for (chp = 0; chp < 8; chp++) 1093 if (dasd_path_is_nohpf(device, chp)) 1094 hpfpm |= 0x80 >> chp; 1095 return hpfpm; 1096 } 1097 1098 /* 1099 * add functions for path masks 1100 * the existing path mask will be extended by the given path mask 1101 */ 1102 static inline void dasd_path_add_tbvpm(struct dasd_device *device, __u8 pm) 1103 { 1104 int chp; 1105 1106 for (chp = 0; chp < 8; chp++) 1107 if (pm & (0x80 >> chp)) 1108 dasd_path_verify(device, chp); 1109 } 1110 1111 static inline __u8 dasd_path_get_notoperpm(struct dasd_device *device) 1112 { 1113 int chp; 1114 __u8 nopm = 0x00; 1115 1116 for (chp = 0; chp < 8; chp++) 1117 if (dasd_path_is_nohpf(device, chp) || 1118 dasd_path_is_ifcc(device, chp) || 1119 dasd_path_is_cuir(device, chp) || 1120 dasd_path_is_miscabled(device, chp)) 1121 nopm |= 0x80 >> chp; 1122 return nopm; 1123 } 1124 1125 static inline void dasd_path_add_opm(struct dasd_device *device, __u8 pm) 1126 { 1127 int chp; 1128 1129 for (chp = 0; chp < 8; chp++) 1130 if (pm & (0x80 >> chp)) { 1131 dasd_path_operational(device, chp); 1132 /* 1133 * if the path is used 1134 * it should not be in one of the negative lists 1135 */ 1136 dasd_path_clear_nohpf(device, chp); 1137 dasd_path_clear_cuir(device, chp); 1138 dasd_path_clear_cable(device, chp); 1139 dasd_path_clear_ifcc(device, chp); 1140 } 1141 } 1142 1143 static inline void dasd_path_add_cablepm(struct dasd_device *device, __u8 pm) 1144 { 1145 int chp; 1146 1147 for (chp = 0; chp < 8; chp++) 1148 if (pm & (0x80 >> chp)) 1149 dasd_path_miscabled(device, chp); 1150 } 1151 1152 static inline void dasd_path_add_cuirpm(struct dasd_device *device, __u8 pm) 1153 { 1154 int chp; 1155 1156 for (chp = 0; chp < 8; chp++) 1157 if (pm & (0x80 >> chp)) 1158 dasd_path_cuir(device, chp); 1159 } 1160 1161 static inline void dasd_path_add_ifccpm(struct dasd_device *device, __u8 pm) 1162 { 1163 int chp; 1164 1165 for (chp = 0; chp < 8; chp++) 1166 if (pm & (0x80 >> chp)) 1167 dasd_path_ifcc(device, chp); 1168 } 1169 1170 static inline void dasd_path_add_nppm(struct dasd_device *device, __u8 pm) 1171 { 1172 int chp; 1173 1174 for (chp = 0; chp < 8; chp++) 1175 if (pm & (0x80 >> chp)) 1176 dasd_path_nonpreferred(device, chp); 1177 } 1178 1179 static inline void dasd_path_add_nohpfpm(struct dasd_device *device, __u8 pm) 1180 { 1181 int chp; 1182 1183 for (chp = 0; chp < 8; chp++) 1184 if (pm & (0x80 >> chp)) 1185 dasd_path_nohpf(device, chp); 1186 } 1187 1188 static inline void dasd_path_add_ppm(struct dasd_device *device, __u8 pm) 1189 { 1190 int chp; 1191 1192 for (chp = 0; chp < 8; chp++) 1193 if (pm & (0x80 >> chp)) 1194 dasd_path_preferred(device, chp); 1195 } 1196 1197 /* 1198 * set functions for path masks 1199 * the existing path mask will be replaced by the given path mask 1200 */ 1201 static inline void dasd_path_set_tbvpm(struct dasd_device *device, __u8 pm) 1202 { 1203 int chp; 1204 1205 for (chp = 0; chp < 8; chp++) 1206 if (pm & (0x80 >> chp)) 1207 dasd_path_verify(device, chp); 1208 else 1209 dasd_path_clear_verify(device, chp); 1210 } 1211 1212 static inline void dasd_path_set_opm(struct dasd_device *device, __u8 pm) 1213 { 1214 int chp; 1215 1216 for (chp = 0; chp < 8; chp++) { 1217 dasd_path_clear_oper(device, chp); 1218 if (pm & (0x80 >> chp)) { 1219 dasd_path_operational(device, chp); 1220 /* 1221 * if the path is used 1222 * it should not be in one of the negative lists 1223 */ 1224 dasd_path_clear_nohpf(device, chp); 1225 dasd_path_clear_cuir(device, chp); 1226 dasd_path_clear_cable(device, chp); 1227 dasd_path_clear_ifcc(device, chp); 1228 } 1229 } 1230 } 1231 1232 /* 1233 * remove functions for path masks 1234 * the existing path mask will be cleared with the given path mask 1235 */ 1236 static inline void dasd_path_remove_opm(struct dasd_device *device, __u8 pm) 1237 { 1238 int chp; 1239 1240 for (chp = 0; chp < 8; chp++) { 1241 if (pm & (0x80 >> chp)) 1242 dasd_path_clear_oper(device, chp); 1243 } 1244 } 1245 1246 /* 1247 * add the newly available path to the to be verified pm and remove it from 1248 * normal operation until it is verified 1249 */ 1250 static inline void dasd_path_available(struct dasd_device *device, int chp) 1251 { 1252 dasd_path_clear_oper(device, chp); 1253 dasd_path_verify(device, chp); 1254 } 1255 1256 static inline void dasd_path_notoper(struct dasd_device *device, int chp) 1257 { 1258 dasd_path_clear_oper(device, chp); 1259 dasd_path_clear_preferred(device, chp); 1260 dasd_path_clear_nonpreferred(device, chp); 1261 } 1262 1263 /* 1264 * remove all paths from normal operation 1265 */ 1266 static inline void dasd_path_no_path(struct dasd_device *device) 1267 { 1268 int chp; 1269 1270 for (chp = 0; chp < 8; chp++) 1271 dasd_path_notoper(device, chp); 1272 1273 dasd_path_clear_all_verify(device); 1274 } 1275 1276 /* end - path handling */ 1277 1278 #endif /* DASD_H */ 1279